An experimental study on the effects of adding biomass ashes on ash sintering behavior of Zhundong coal

Zhou, Hao; Ma, Weichen

doi:10.1016/j.applthermaleng.2017.07.199

Cited by 34 publications

(11 citation statements)

References 36 publications

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“…However, for the ash system with a low content of silicon and alumina, some free basic oxides may form (e.g., CaO, MgO) with a high melting point (MP), which results in an increase in the T s or AFT with an increase in the B/A. The AFT reaches a minimum at an intermediate B/A ratio of 0.75. , The B/A value of the SM (2.19) is higher than that of the CM (1.13) (both >0.75). These results may explain why the AFT or T s of the SM is higher than that of the CM.…”

Section: Resultsmentioning

confidence: 99%

Investigation on Ash-Fusion Characteristics of Livestock Manure and Low-Rank Coals

Zhao

Fan

et al. 2020

Energy Fuels

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Large amounts of livestock manure are produced annually, and cogasification offers a promising method for large-scale and clean use of manure. To investigate the ash-fusion characteristics (AFC) of livestock manure and coal, and their variation mechanisms, the AFCs of two coals (Yima long-flame coal and Husheng lignite), two manures (cattle manure (CM), and swine manure (SM)), and their mixtures were explored. An increase in the ash mass ratio of the CM or SM increased the sintering temperature (T s) of two mixed coal ashes (the SM enhanced the T s more than that of the CM); however, their ash-fusion temperature (AFT) decreased first and then increased (the turning points for the Yima long-flame coal ash mixture were CM: ∼60% and SM: ∼40%, and those for the Husheng lignite were SM: ∼70% and SM: ∼50%). The T s was induced by partial particle surface fusion, and was related to the formation of a low melting eutectic (e.g., binary systems for K2SiO3–Na2Si2O5 and Na2S–FeS) and their contents. The AFT indicated that the bulk melting property was determined mainly by ash composition, especially for a basic/acid ratio. The disappearance of mullite and the formation of high melting-point phosphates (e.g., KCaPO4, K2CaP2O7, and Ca2.71Mg0.27(PO4)2) resulted in AFT fluctuations of the mixtures.

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Section: Resultsmentioning

confidence: 99%

Investigation on Ash-Fusion Characteristics of Livestock Manure and Low-Rank Coals

Zhao

Fan

et al. 2020

Energy Fuels

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“…But researchers have conducted relevant work in this area and concluded that more wollastonite, anorthite and gehlenite formed and low-melting-point eutectics of Ca-Si-Al-O produced which existed in the co-combustion ash when rice husk co-fired with ZD coal. Therefore, co-firing ZD coal with rice husk can promote the sintering behaviour of ZD coal [12], which is unfavourable for the combustion of ZD coal. These results indicate that the high contents of moisture and volatiles, and the high content of AAEMs in biomass have significant effects on the combustion and ash characteristics.…”

Section: Introductionmentioning

confidence: 99%

Co‐combustion and ash characteristics of Zhundong coal with rice husk hydrochar prepared by the hydrothermal carbonization technology for co‐combustion

Wang

Zhu

et al. 2021

IET Renewable Power Gen

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The high content of the AAEMs in Zhundong (ZD) coal causes easily slagging on the heating surface of boilers, and the addition of rice husk hydrochar (RHC) is expected to alleviate slagging by introducing SiO2 content. ZD coal is co‐fired with RHC according to different blend ratios, co‐combustion ashes are prepared subsequently at different temperatures. The co‐combustion characteristics of blends are studied firstly by using TGA, considering the combustion process can bring impacts on ash characteristics. Then the effects of the blend ratio and ashing temperature on the ash characteristics are discussed. The ash samples are characterized by XRF, ICP‐AES, XRD and SEM. The results show that an increase in the blend ratio of the RHC reduces the ignition temperature and lengthens the burnout time, which transforms the ash characteristics. The contents of quartz, gehlenite and andalusite greatly increase. The number of fine particles in the ash decreases, while the particle size increases. The ash fusion temperatures (AFTs) are at the lowest value at 8:2 and exceed totally that of ZD coal at 7:3. Considering to increase the AFTs of ZD coal, at least the blend ratio of 7:3 of ZD coal and RHC is recommended for co‐combustion.

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“…A large volume of studies has been carried out on ash fusion characteristics of coal and biomass ash, mainly involving AFTs, 14–16 mineral phases, 17,18 and their interactions of coal/biomass ash, 19,20 as well as the evolution of troublesome elements 3,21,22 . The research on ash fusion characteristics is usually associated with the analysis of AFTs obtained from high‐temperature fusion test.…”

Section: Introductionmentioning

confidence: 99%

Experimental and kinetic studies on ash fusion behavior: a high‐precision acquisition method for ash fusion temperatures

Yuan

Niu

Wang

et al. 2021

Asia-Pacific J Chem Eng

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Ash fusion characteristics including ash properties and morphological changes in high‐temperature fusion test were studied among four types of fuels comprising two woody biomass, three straw biomass, two bituminous coals, and three biomass/coal mixtures. On the basis of ash fusion behavior and kinetic analysis of the ash melting process, a high‐precision acquisition method for ash fusion temperatures (AFTs) was developed. First, a reading index of AFTs was proposed; that is, in high‐temperature fusion test, initial deformation temperature (IDT), softening temperature (ST), and fluid temperature (FT) could be identified by the height shrinkage of 38%, 86%, and 98%, or the area shrinkage of 50%, 77%, and 97%, respectively. Kinetic analysis conducted on height/area shrinkage indicated that activation energy was highly related to temperature difference among IDT, ST, and FT, and low activation energy facilitated the enlargement of the temperature differences of ST‐IDT and FT‐ST. XRD patterns illustrated low activation energy had a promotion effect on the generation of higher melting substances such as KAlSi3O8 and CaSiO3, causing the elevation of the ST and FT. At last, a calculation method for AFTs based on activation energy and average height/area shrinkage was performed, which had high repeatability within an average error of ~6°C.

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An experimental study on the effects of adding biomass ashes on ash sintering behavior of Zhundong coal

Cited by 34 publications

References 36 publications

Investigation on Ash-Fusion Characteristics of Livestock Manure and Low-Rank Coals

Investigation on Ash-Fusion Characteristics of Livestock Manure and Low-Rank Coals

Co‐combustion and ash characteristics of Zhundong coal with rice husk hydrochar prepared by the hydrothermal carbonization technology for co‐combustion

Experimental and kinetic studies on ash fusion behavior: a high‐precision acquisition method for ash fusion temperatures

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